<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			.box{
				height: 2000px;
				background-color: #00FFFF;
				
			}
			.musen{
				background-color: #FF0000;
				width: 200px;
				height: 200px;
				/* 固定元素位置 */
				position: fixed;
				/* 设置元素距离顶端200px */
				top: 200px;
			}
		</style>
	</head>
	<body>
		<div >
			python----页面开始
		</div>
		<div class="box">
			
		</div>
		<div >
			python----页面结束
		</div>
		<div class="musen">
			
		</div>
	</body>
</html>
